Xin LI 55f6421982 - Fix handling of "new" style of ioctl in compatiblity mode [1];
- Reorganize code and reduce diff from upstream;
 - Improve forward compatibility shims for previous kernel;

Reported by:	sbruno [1]
X-MFC-With:	r268075
2014-07-01 20:57:39 +00:00
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